Whats you thought on this subject. I see a few of you guys with custom bike running a chamber. Definitely the way to go with the 2-Smokers.
Miguel
Miguel
What about welding a long outlet pipe to the end of the Spooky expansion chamber that is bolted to the jug? Would I still have a performance increase? Im mainly looking for better mileage as I use this one for a commuter.Anything that effects performance effects fuel mileage - but you may not notice that benefit as ya will prolly get on it more due to the power increase lol The Spooky one hasn't got any length of headpipe at all & the optimum headpipe length for an expansion chamber & powerband is about 12 inches (altering headpipe length allows some ability to "tune") - as you're considering extending it to a full length system, ya may wish to weld it to the stock headpipe for maximum gain as I've done w/the SBP system;
I didn't notice any increase in spit-back, that's an interesting question! I suppose it's conceivable given the effect of an expansion chamber... but even if there was it was so marginal I didn't notice & it'd be worth it anyway I figure. As for welding the stock muffler on the end... well... I suppose it'd depend on which muffler you've got. The catalytic mufflers belong in the trash can, they just load up with unspent oil & carbon and will defeat the purpose - but the just baffled ones should be aright *shrug* I't defo quiet it down a bunch I run an extended glasspack for maximum flow, but some have added utility engine/lawnmower mufflers to help with the noise...
What I mean is, in addition to welding a head pipe to it, welding a tailpipe also to take the length out to the middle of the rear tire area? What will adding this tail pipe do?I'm not sure what you're asking?
If you're going to add a stinger to the end of the spooky pipe, I'd cut off the little angled nub flush with that flat back cap and grind it out large enough to fit a piece of tubing just under 1/2" in diameter. Cut the piece of tubing about 6" long and slide it into the ground out hole about 1/2", set the angle you want and then weld it. You can cut it down any length from there and even add a silencer to that if desired.What I mean is, in addition to welding a head pipe to it, welding a tailpipe also to take the length out to the middle of the rear tire area? What will adding this tail pipe do?
Thanks,
Pat
So... having a 10" headpipe gives a far broader band than the Spooky pipe w/no headpipe at all, but is a touch "peaky" compared to the full 12" - it'd "get on the pipe" a lil earlier with 10" over 12" which is good fer me 'cause my ride weighs about a zillion pounds & I need the acceleration lol but if yer after max top speed then ya prolly wanna be closer to 12" - but remember, these are marginal changes, something you'd prolly not notice w/o a dyno....The exhaust sound wave expands down the front taper then hits the rear taper (which is usually at double the angle of the front) reflecting the wave back at the header tube. The idea is to get the header length "tuned" to have the wave hit the exhaust port just before the piston closes it. Stuffing some of the energy back into the port along with some of the exhaust gases as the piston goes up. The faster the engine is spinning (or the shorter the piston stroke is) the shorter the header needs to be to deliver the charge at the right time. To long a header and it's late, to short and it's early. A little long and you get a broader band. As they get shorter the rpm range is more sensitive but the pipe adds more to the HP. It's a balancing act.
Well ok, sounds like modidying the spooky pipe wont do me any good. The priority here for me is to get the exhaust out to the back of the bike, so Im gonna just lengthen the stock pipe to accomplish that. So...Does anyone want a brand new Spooky Tooth (Grubee) expansion chamber? Ill sell it for $40 plus shipping
Pat
Thank you buddy, but it has been sold already.Well, since I feel somewhat responsible for talking you out of doing the install I should buy it from you.
And to think that I havent even taken my kit out of the carton yet. Still havnt put one of these motorized bikey things together. But when I do I plan on it being be real special!
Miguel